"gammas" in the noun sense
the 3rd letter of the Greek alphabet
a unit of magnetic field strength equal to one-hundred-thousandth of an oersted
3. da Gamma, Vasco da Gamma, Gamma
Portuguese navigator who led an expedition around the Cape of Good Hope in 1497 he sighted and named Natal on Christmas Day before crossing the Indian Ocean (1469-1524)
Source: WordNet® (An amazing lexical database of English)
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